Timer for 20 minutes.
This is a mechanical timepiece which can be set to the desired time of 1 to 20 minutes. If you start the alarm, over time you'll hear a sound. The timer has a unique roller pendulum and self adjustment system on the back wall.
Our timer works from the usual clerical gum.
For a long time we have improving this model so that everyone can collect this amazing clockwork!

*Self-assembly model with no glue
*Self-adjustment system
*Material: plywood